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Soil cation storage as a key control on the timescales of carbon dioxide removal through enhanced weathering
ABSTRACT
Significant interest and capital are currently being channeled into techniques for durable
carbon dioxide removal (CDR) from Earth’s atmosphere. A particular class of these approaches
(referred to as enhanced weathering (EW)) seeks to modify the surface alkalinity budget to
durably store CO2 as dissolved inorganic carbon species. Here, we use SCEPTER (a reaction-
transport code designed to simulate EW in managed lands) to evaluate the throughput and
storage timescales of anthropogenic alkalinity in agricultural soils. Through a series of alkalinity
flux simulations, we explore the main controls on cation storage and export from ...